World energy sources

8.2.1 Identify different world energy sources.

. World Energy Source .	CO2 Emission (Y/N)	. Prime Energy Source .
Hydroelectric	No	Sun
Wind	No	Sun
Water Currents	No	Sun
Tidal Energy	No	Moon & Sun's Gravity
Solar	No	Sun
Bio Fuels	Yes	Sun
Fossil Fuels	Yes	Sun
Nuclear Fission	No	Nucleus
Geothermal	No	Energy in Earth's Core

8.2.2 Outline and distinguish between renewable and non-renewable energy sources.

Renewable energy sources cannot be used up or are replenished in a reasonable amount of time.

Non-renewable energy sources have a finite supply on Earth.

. Renewable .	. Non-renewable .
Solar	Fossil Fuels (Oil, Gasoline, Coal, Natural Gas)
Hydroelectric	Uranium (Nuclear)
Tides (Waves)
Wind
Geothermal
Biofuels

8.2.3 Define the energy density of a fuel.

Energy density is the amount of energy released per unit mass of fuel consumed.

Energy density is measured in J / kg

8.2.4 Discuss how choice of fuel is influenced by its energy density.

Energy density determines the amount of fuel needed to produce a certain amount of energy.

The amount of fuel used affects

• costs of purchasing / mining

• costs of transporting and storing

• costs of refining / enrichment

• environmental impact

8.2.5 State the relative proportions of world use of the different energy sources that are available.

Only approximate values are needed
38 % Oil
24 % Coal
24 % Natural Gas
6 % Nuclear
4 % Biomass
3 % Hydroelectric
1 % Solar Heat, Wind, Geothermal, Solar PV combined

If you wish to see comparisons between 2007 and 2004 global energy source consumption, see website:
http://www.ren21.net/globalstatusreport/download/RE_GSR_2006_Update.pdf

8.2.6 Discuss the relative advantages and disadvantages of various energy sources.

This section has its own page. [Advantages and Disadvantages]